Replace get_item_path[-1] with get_item_name

src/librustc/metadata/csearch.rs

@@ -95,6 +95,12 @@ pub fn get_item_path(tcx: &ty::ctxt, def: ast::DefId) -> Vec<ast_map::PathElem>
     })
 }
 
+pub fn get_item_name(tcx: &ty::ctxt, def: ast::DefId) -> ast::Name {
+    let cstore = &tcx.sess.cstore;
+    let cdata = cstore.get_crate_data(def.krate);
+    decoder::get_item_name(&cstore.intr, &cdata, def.node)
+}
+
 pub enum FoundAst<'ast> {
     Found(&'ast ast::InlinedItem),
     FoundParent(ast::DefId, &'ast ast::InlinedItem),

src/librustc/metadata/decoder.rs

@@ -770,6 +770,10 @@ pub fn get_item_path(cdata: Cmd, id: ast::NodeId) -> Vec<ast_map::PathElem> {
     item_path(lookup_item(id, cdata.data()))
 }
 
+pub fn get_item_name(intr: &IdentInterner, cdata: Cmd, id: ast::NodeId) -> ast::Name {
+    item_name(intr, lookup_item(id, cdata.data()))
+}
+
 pub type DecodeInlinedItem<'a> =
     Box<for<'tcx> FnMut(Cmd,
                         &ty::ctxt<'tcx>,

src/librustc/middle/intrinsicck.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use ast_map::NodeForeignItem;
-use metadata::csearch;
 use middle::def::DefFn;
 use middle::subst::{Subst, Substs, EnumeratedItems};
 use middle::ty::{TransmuteRestriction, ctxt, TyBareFn};
@@ -57,21 +55,7 @@ impl<'a, 'tcx> IntrinsicCheckingVisitor<'a, 'tcx> {
             ty::TyBareFn(_, ref bfty) => bfty.abi == RustIntrinsic,
             _ => return false
         };
-        if def_id.krate == ast::LOCAL_CRATE {
-            match self.tcx.map.get(def_id.node) {
-                NodeForeignItem(ref item) if intrinsic => {
-                    item.ident.name == "transmute"
-                }
-                _ => false,
-            }
-        } else {
-            match csearch::get_item_path(self.tcx, def_id).last() {
-                Some(ref last) if intrinsic => {
-                    last.name() == "transmute"
-                }
-                _ => false,
-            }
-        }
+        intrinsic && self.tcx.item_name(def_id) == "transmute"
     }
 
     fn check_transmute(&self, span: Span, from: Ty<'tcx>, to: Ty<'tcx>, id: ast::NodeId) {

src/librustc/middle/ty.rs

@@ -5927,6 +5927,14 @@ impl<'tcx> ctxt<'tcx> {
         }
     }
 
+    pub fn item_name(&self, id: ast::DefId) -> ast::Name {
+        if id.krate == ast::LOCAL_CRATE {
+            self.map.get_path_elem(id.node).name()
+        } else {
+            csearch::get_item_name(self, id)
+        }
+    }
+
     /// Returns `(normalized_type, ty)`, where `normalized_type` is the
     /// IntType representation of one of {i64,i32,i16,i8,u64,u32,u16,u8},
     /// and `ty` is the original type (i.e. may include `isize` or